- 1 year ago
JNA | User32#PostMessage WM_MOUSEMOVE
In JNA (Java Native Access), you can use the User32
class to invoke the PostMessage
function from the user32.dll library in Windows. Here's an example of how to send a WM_MOUSEMOVE
message using JNA:
javaimport com.sun.jna.Native;
import com.sun.jna.platform.win32.User32;
import com.sun.jna.platform.win32.WinDef.HWND;
import com.sun.jna.platform.win32.WinDef.LPARAM;
import com.sun.jna.platform.win32.WinDef.WPARAM;
public class MouseMoveExample {
public static void main(String[] args) {
HWND hWnd = User32.INSTANCE.FindWindow(null, "Window Title"); // Replace "Window Title" with the actual window title
if (hWnd != null) {
int x = 100; // Replace with the desired X-coordinate
int y = 100; // Replace with the desired Y-coordinate
int lParam = (y << 16) | x;
User32.INSTANCE.PostMessage(hWnd, User32.WM_MOUSEMOVE, new WPARAM(0), new LPARAM(lParam));
}
}
}
Make sure you have JNA library added to your project's dependencies. The code uses the User32.INSTANCE.FindWindow
method to find the handle of the target window by its title. Then, it constructs the lParam
value by shifting the Y-coordinate to the high word and the X-coordinate to the low word. Finally, it calls User32.INSTANCE.PostMessage
with the appropriate parameters to send the WM_MOUSEMOVE
message to the window.
Note that you need to replace "Window Title" with the actual title of the target window, and set the desired X and Y coordinates for the mouse movement.